. Author manuscript; available in PMC: 2015 Nov 1.

Published in final edited form as: Am J Geriatr Psychiatry. 2013 Jul 23;22(11):1210–1221. doi: 10.1016/j.jagp.2013.04.002

Table 2.

Descriptive Data of Cardiac Measurement

Descriptive (Mean and SD)	Baseline ^‡	Math task	Stroop task	Repeated ANOVA^*				Reactivity^§
				Bonferroni adjusted pairwise t test (df = 424)			F _{(2, 424)}
				Mean Difference (SE)
				Math – Baseline	Stroop – Baseline	Math – Stroop
HR	71.29 (11.11)	74.30 (10.83)	75.36 (11.43)	2.94 (0.16) ^a	4.00 (0.19) ^a	−1.06 (0.14) ^a	313.29 ^a	2.60 (0.27)^†
LF HRV	5.10 (1.12)	4.61 (1.12)	4.37 (1.16)	−0.50 (0.04) ^a	−0.72 (0.04) ^a	0.22 (0.04) ^a	172.30 ^a	−0.73 (0.87)
HF HRV	4.53 (1.25)	4.39 (1.18)	4.00 (1.28)	−0.16 (0.03) ^a	−0.53 (0.04) ^a	0.38 (0.03) ^a	124.41 ^a	−0.52 (0.79)

Note.

^‡

average score of baseline assessment at two time points;

61 cases were missing;

^§

Reactivity = cardiac Stroop task activity cardiac baseline activity, given that Stroop task induced significantly greater reactivity than Math task did;

^†

the distribution of raw scores was skewed and some scores were negative, thus natural log transformation was performed as ln (Stroop – Baseline + 10);

p < .001.